Fukushima Daiichi NPS Prompt Report (Aug 02, 2013)Tritium Density Result of Water Quality Survey inside the Port of Fukushima Daiichi NPS (Follow-up Information 28)
This is follow-up information on the latest situation concerning the detection of high densities of Tritium and Strontium in the observation hole at the east side of the Unit 1-4 Turbine Buildings of Fukushima Daiichi NPS.
Today (on August 2), we would like to make an announcement on tritium densities measured in water sampled on July 31 from the Unit 2 seawater pipe trench vertical shaft C and the Unit 3 seawater pipe trench vertical shaft B where sampling has been newly started for the survey conducted for such purposes as identification of the contamination source of high-density contaminated water inside the sea-side trench, as we obtained the results as follows.
With regards to the analysis results on the Unit 2 seawater pipe trench vertical shaft C, the 1-meter and 7-meter water depth locations showed the same value, and the 13-meter water depth location showed higher values than the 1-meter and 7-meter water depth locations. With regards to the analysis results on the Unit 3 seawater pipe trench vertical shaft B, no water-depth related difference was found.
<Unit 2 seawater pipe trench vertical shaft C>
- Sampling on July 31:
[1-m water depth]
Tritium 2,400,000Bq/L (2,400Bq/cm
3) (new)
Chlorine 700ppm (previously announced)
Cesium-134 110,000,000Bq/L (110,000Bq/cm
3) (previously announced)
Cesium-137 230,000,000Bq/L (230,000Bq/cm
3) (previously announced)
All-β 330,000,000Bq/L (330,000Bq/cm
3) (previously announced)
[7-m water depth]
Tritium 2,400,000Bq/L (2,400Bq/cm
3) (new)
Chlorine 700ppm (previously announced)
Cesium-134 110,000,000Bq/L (110,000Bq/cm
3) (previously announced)
Cesium-137 240,000,000Bq/L (240,000Bq/cm
3) (previously announced)
All-β 330,000,000Bq/L (330,000Bq/cm
3) (previously announced)
[13-m water depth]
Tritium 4,600,000Bq/L (4,600Bq/cm
3) (new)
Chlorine 7,500ppm (previously announced)
Cesium-134 300,000,000Bq/L (300,000Bq/cm
3) (previously announced)
Cesium-137 650,000,000Bq/L (650,000Bq/cm
3) (previously announced)
All-β 520,000,000Bq/L (520,000Bq/cm
3) (previously announced)
<Unit 3 seawater pipe trench vertical shaft B>
- Sampling on July 31:
[1-m water depth]
Tritium 360,000Bq/L (360Bq/cm
3) (new)
Chlorine 16,000ppm (previously announced)
Cesium-134 13,000,000Bq/L (13,000Bq/cm
3) (previously announced)
Cesium-137 26,000,000Bq/L (26,000Bq/cm
3) (previously announced)
All-β 32,000,000Bq/L (32,000Bq/cm
3) (previously announced)
[7-m water depth]
Tritium 340,000Bq/L (340Bq/cm
3) (new)
Chlorine 17,000ppm (previously announced)
Cesium-134 10,000,000Bq/L (10,000Bq/cm
3) (previously announced)
Cesium-137 22,000,000Bq/L (22,000Bq/cm
3) (previously announced)
All-β 34,000,000Bq/L (34,000Bq/cm
3) (previously announced)
[13-m water depth]
Tritium 350,000Bq/L (350Bq/cm
3) (new)
Chlorine 17,000ppm (previously announced)
Cesium-134 12,000,000Bq/L (12,000Bq/cm
3) (previously announced)
Cesium-137 24,000,000Bq/L (24,000Bq/cm
3) (previously announced)
All-β 34,000,000Bq/L (34,000Bq/cm
3) (previously announced)
<Quality of water leaked into the Unit 2 water intake screen room in April 2011>
Cesium-134 1,800,000,000Bq/L (1,800,000Bq/cm
3)
Cesium-137 1,800,000,000Bq/L (1,800,000Bq/cm
3)
We are continuing to tackle this problem in such manners as to intensely bring forward implementation of contamination prevention measures such as foundation improvement work to the bank protection, and comprehensively intensify the monitoring by using the results of additional boring to drill additional locations, and the analyses results on seawater at such locations as the port interior and the water outlets.
For the past sampling results, please refer to the following page on our website:
http://www.tepco.co.jp/en/nu/fukushima-np/f1/smp/index-e.html
